Question

Account for the following:

Account for the following : (1) Zn²⁺ salts are colourless while Ni²⁺ salts are coloured. (2) Cr²⁺ is a strong reducing agent. (3) Transition metals and their compounds show catalytic activities.

Write the ionic equations for the oxidizing action of MnO₄⁻ in acidic medium with (1) I⁻ ion, and (2) Fe²⁺ ion.

Name two oxometal anions of the 3d series of the transition metals in which the metal exhibits the oxidation state equal to its group number.